This class contains information about a bi-molecular interaction. At present it just contains data about a weight (optional) and an identifier. Subclasses could hold more specific information. A pair of nodes can have more than one Interaction object associated with it.

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Name : nodes
Purpose : Get the pair of nodes for an Interaction
Usage : my $count = $interx->nodes
or
my @nodes = $interx->nodes
Returns : Gets an array of 2 Nodes or a count of the number of
Nodes
Arguments :
Notes : Getting a count of the number of Nodes in an Interaction
will almost always return 2, but there is a formal possibility
that a Node could interact with itself, returning 1